apiregen

ApiRegen

API reverse engineering toolkit for Claude Code.

Capture web traffic as HAR files, then let Claude analyze the endpoints, classify domains, detect auth patterns, and generate typed client code.

Prerequisites

• Claude Code installed
• Python 3.11+
• uv

Install

claude plugin marketplace add livedge/apiregen
claude plugin install apiregen

Restart Claude Code. Done.

Usage

Open Claude Code in any project directory and use the slash commands:

Command	What it does
/capture	Walks you through capturing web traffic as HAR files
/recon	Analyze captured traffic — domains, auth, protection, stack
/mapping	Cross-session differential analysis
/report	Full API intelligence report
/schema	Infer JSON schema from endpoints
/typegen	Generate typed classes (TypeScript, C#, Python, etc.)
/investigate	Ad-hoc deep-dive into specific endpoints

Typical workflow

1. /capture — capture traffic from target site (browser DevTools, Camoufox, or mitmproxy)
2. /recon — Claude analyzes the traffic and builds a context profile
3. /report — Claude writes a complete API intelligence report
4. /typegen — generate typed client code from discovered endpoints

Standalone CLI (optional)

For use outside Claude Code:

# Install with CLI dependencies
uv tool install apiregen[cli]

# Guided interactive workflow
apiregen start

# Or individual commands
apiregen init myproject
apiregen capture -m browser -o myproject/captures/session1.har
apiregen recon myproject

Add browser capture support: uv tool install apiregen[cli,browser]

Add mitmproxy support: uv tool install apiregen[cli,mitmproxy]

How it works

The plugin provides an MCP server (apiregen-har) with 16 tools for loading, searching, and analyzing HAR files. The slash commands give Claude structured prompts to use these tools for deep API analysis.

All intelligent analysis (domain classification, auth detection, protection identification) is done by Claude — the Python code only handles data parsing and querying.

License

MIT